This is exactly the reason why eviolite should be banned. While the Abra would most likely be used over Alakazam, once you factor eviolite there would be NO reason to use Zam. I'm sure this applies for evolutionary lines across the board. Since, I think, the point of this metagame would be to able to use much more pokemon in the standard setting, eviolite would definitely be counter-productive.Abra: 38/30/22/155/81/133
Yep, sight improvement in ability to take Physical attacks, but at the cost of 29 points of Special attack and 21 points of Speed. In this metagame, Pokemon can get worse as they evolve.
We just figured out why Ash's Pikachu doesn't want to evolve!
Joking aside, Eviolite looks really interesting, since a First Stage Pokemon has the same BST as a Fully evolved Pokemon, but can use Eviolite and make itself much bulkier.
Not necessarily, it wasn't banned in Little Cup, though there was some serious discussion about it, given how much it changed the metagame compared to Gen4.